Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
dinh chi » dinh thi, dinh tri, dinh moi
thuc cua » hoc cua, thuc va
cua dan » cua dang, cua ban, ca dan
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky ((mang may) or (nang cao)) hoi. hieu ve cac thuc cua dan ((dinh cuu) or (dinh chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((mang may) OR (nang cao)) hoi. hieu ve cac thuc cua dan ((dinh cuu) OR (dinh chi)) tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((mang may) or (nang cao)) hoi. hieu ve cac thuc cua dan ((dinh cuu) or (dinh chi)) tre*.